Flush valve



FIG. 1 is a top view of a flush valve showing our new flush valve design;

FIG. 2 is a side view of our flush valve design;

FIG. 3 is a front view of our new flush valve design;

FIG. 4 is a rear view of our new flush valve design; and,

FIG. 5 is a bottom view of our new flush valve design. 

The ornamental design for a flush valve, as shown and described. 